Where does “unfallible” come from?

unfallible (English) comes from English fallible, from Middle English fallible, from Medieval Latin fallibilis, from Latin fallēre.

unfallible (English): Obsolete form of infallible

Definitions

  1. Obsolete form of infallible

Ancestry of “unfallible”, step by step

unfallible traces back through two separate lines of ancestry.

via English fallible

StepLanguageWordMeaning
1EnglishfallibleCapable of making mistakes or being wrong
2Middle Englishfallible—
3Medieval Latinfallibilisliable to err, also deceitful; Liable to error;...
4Latinfallēre—

via English un

StepLanguageWordMeaning
1EnglishunOne
Every word from Latin fallēre →Every word from Medieval Latin fallibilis →Every word from Middle English fallible →